History Taking for Shortness of Breath (Dyspnea) - MBBS 4th Year Medicine

1. Presenting Complaint

2. History of Presenting Complaint (HOPI)

A. ONSET

B. DURATION

• How long has it been present?
• Is it the first episode or recurrent?

C. PROGRESSION

• Getting worse, better, or same?
• Constant or episodic?
• Diurnal variation? (Worse at night = asthma/HF; worse in morning = COPD)

D. SEVERITY

• MRC Dyspnea Scale (Grades 1-5):
  • Grade 1: Only on strenuous exertion
  • Grade 2: Walking on incline or hurrying on level
  • Grade 3: Walks slower than peers on level / stops after ~100 m
  • Grade 4: Too breathless to leave the house
  • Grade 5: Breathless on dressing/undressing or at rest
• Compare functional capacity: "How many stairs can you climb? How far can you walk?"

E. CHARACTER / QUALITY

• Air hunger / suffocation (often cardiac or metabolic)
• Chest tightness (asthma, COPD, ACS)
• Inability to take a deep breath (hyperventilation, pleuritis)
• Increased effort / heavy breathing (respiratory muscle weakness, COPD)

F. POSITIONAL FACTORS (very important for 4th year!)

G. AGGRAVATING AND RELIEVING FACTORS

• Exercise, cold air, dust/smoke (asthma/COPD)
• Seasonal or allergic triggers (asthma)
• Improvement with rest (cardiac causes)
• Improvement with bronchodilators (obstructive airway disease)
• Improvement over weekends vs. weekdays (occupational lung disease)

H. ASSOCIATED SYMPTOMS (pivotal for differential diagnosis)

• Cough - productive (pneumonia, bronchiectasis, HF - "pink frothy"), dry (ILD, ACE inhibitor)
• Sputum - color, amount, hemoptysis (PE, TB, cancer, bronchiectasis)
• Wheeze - heard by patient? (asthma, COPD, cardiac asthma)
• Stridor - inspiratory noise (upper airway obstruction)
• Pleuritic chest pain - sharp, worse on breathing/coughing (pneumonia, PE, pneumothorax, pleuritis)

• Chest pain - nonpleuritic (ACS, aortic dissection, valvular disease)
• Palpitations (arrhythmia causing dyspnea)
• Pedal edema (biventricular HF, nephrotic syndrome, hypoalbuminemia)
• Syncope / pre-syncope (severe valvular disease, severe PE)
• Paroxysmal nocturnal dyspnea / orthopnea (as above)

• Fever + productive cough (pneumonia, bronchitis, exacerbation of COPD/asthma)
• Weight loss + night sweats + chronic cough (TB, malignancy, HIV)
• Pallor / fatigue (anemia causing dyspnea)
• Ankle swelling + ascites (right heart failure, hepatic disease)
• Leg swelling (unilateral) (DVT -> PE; ask about Homan's sign history)

3. Past Medical History

• Known cardiac disease: CAD, valvular disease, hypertension, arrhythmia
• Known respiratory disease: asthma, COPD, TB (old or active), bronchiectasis, ILD
• Previous hospitalizations for breathlessness
• History of myocardial infarction or rheumatic fever
• Diabetes mellitus (accelerates CAD)
• History of cancer (lung cancer, PE risk, lymphangitis carcinomatosis)
• Anemia, thyroid disease
• Connective tissue disorders (Raynaud's, SLE, RA -> ILD or pulmonary hypertension)

4. Drug History

• ACE inhibitors -> dry cough (simulates dyspnea)
• Beta-blockers -> can precipitate bronchospasm in asthmatics
• Amiodarone, bleomycin, methotrexate -> pulmonary toxicity/fibrosis
• OCP / HRT (estrogen) -> PE risk
• NSAIDs -> can worsen asthma (aspirin-exacerbated respiratory disease)
• Current use of bronchodilators, diuretics (response confirms diagnosis)

5. Allergy History

• Drug allergies, environmental allergens, occupational sensitizers
• Ask about atopy (eczema, allergic rhinitis, hay fever) - "atopic triad" + asthma

6. Family History

• Asthma, atopy
• Coronary artery disease, hypertension
• Alpha-1 antitrypsin deficiency (early-onset COPD in non-smokers)
• Cystic fibrosis

7. Social History (extremely important for dyspnea)

Smoking

• Pack years = (packs/day) x (years smoked)

• 40 pack years strongly suggests COPD as a cause

• Current/ex-smoker (risk of lung cancer)

Occupation

• Dust exposure: coal, silica, asbestos -> pneumoconiosis (ask about type of work)
• Farming, bird-keeping, mushroom growing -> Hypersensitivity pneumonitis
• Improvement on weekends/holidays = occupational asthma

Alcohol

• Risk factor for cardiomyopathy, aspiration pneumonia

Travel / residence

• TB-endemic areas
• Recent long-haul travel or immobility -> PE risk

Living conditions

• Indoor cooking smoke/biomass fuel exposure (COPD in non-smokers)
• Pet/bird ownership (allergens, Chlamydophila psittaci)

8. Review of Systems (Quick Screening)

• Weight loss / gain (malignancy vs. HF fluid)
• Appetite
• Joint pains / skin rashes (connective tissue disease)
• Swallowing difficulty (aspiration)

Key Summary: The "SOCRATES + Positional" Framework for Dyspnea

Common Diagnoses to Identify from History Alone

• Goldman-Cecil Medicine, Ch. 71 - Approach to the Patient with Dyspnea
• Symptom to Diagnosis: An Evidence Based Guide, Ch. 15
• Fishman's Pulmonary Diseases and Disorders - Dyspnea and Breathlessness
• Textbook of Family Medicine, 9e - Shortness of Breath

Meningitis - Clinical Signs

The Classic Signs of Meningeal Irritation

1. Nuchal Rigidity (Stiff Neck)

• The pathognomonic sign of meningeal irritation
• The neck resists passive flexion - patient cannot touch chin to chest
• Caused by reflex spasm of the extensor muscles of the neck due to inflammation of the meninges covering the cervical spinal cord
• Important caveat: In elderly patients, cervical spondylosis/osteoarthritis can cause false-positive nuchal rigidity. When meningitis is the cause, the neck resists flexion but can be rotated side-to-side (unlike cervical arthritis, where all movements are restricted)

2. Kernig's Sign

1. Patient lies supine
2. Flex the thigh on the abdomen (hip flexed to 90°), with the knee also flexed to 90°
3. Attempt to passively extend the knee
4. Positive sign: Pain and resistance to knee extension (due to traction on inflamed lumbosacral nerve roots / meninges)

3. Brudzinski's Sign

1. Patient lies supine
2. Place one hand behind the patient's head and the other on the chest
3. Passively flex the neck (bring chin toward chest)
4. Positive sign: Reflex spontaneous flexion of both hips and knees

4. Jolt Accentuation Test (newer sign)

• Patient rotates head horizontally at 2-3 times per second
• Positive: Worsening of headache
• Higher sensitivity than Kernig/Brudzinski for meningitis

Full Symptom and Sign Profile

Symptoms (in order of frequency - Goldman-Cecil data):

Signs on Examination:

Organism-Specific Signs

Signs of Raised ICP in Meningitis (>90% have CSF opening pressure >180 mmH₂O)

• Deteriorating/reduced level of consciousness
• Papilledema
• Dilated poorly reactive pupils
• Sixth nerve palsy (CN VI - false localizing)
• Decerebrate posturing
• Cushing's reflex (bradycardia, hypertension, irregular breathing)

Pathophysiology Diagram (Harrison's)

CSF Profiles (Bonus for MBBS - always paired with signs)

• Harrison's Principles of Internal Medicine, 22e, Ch. 143 - Bacterial Meningitis
• Goldman-Cecil Medicine, Ch. 381 - Bacterial Meningitis
• Neuroanatomy through Clinical Cases, 3e, Table 5.6 & 5.7
• Frameworks for Internal Medicine, Ch. 30 - Meningitis

Conditions Causing Blurred Vision + Headache

EMERGENCY / LIFE-THREATENING CAUSES (Rule Out First)

1. Raised Intracranial Pressure (Raised ICP) - Any Cause

• Headache: Dull, worsening with Valsalva, coughing, lying down; worst in morning
• Blurred vision: Due to papilledema (disc swelling compresses retinal nerve fibres)
• Other features: Nausea/vomiting, diplopia (CN VI palsy - false localizing sign), reduced consciousness
• Causes of raised ICP themselves include:
  • Intracranial tumors (primary or metastatic)
  • Brain abscess
  • Subdural / extradural hematoma
  • Hypertensive encephalopathy
  • Cerebral venous sinus thrombosis (CVST)
  • Hydrocephalus (obstructive or communicating)

2. Subarachnoid Hemorrhage (SAH)

• Headache: "Thunderclap" - sudden onset, "worst headache of my life"
• Blurred vision / visual disturbance: Subhyaloid (pre-retinal) hemorrhage on fundoscopy is pathognomonic; raised ICP causes papilledema
• Other features: Meningism, loss of consciousness, CN III palsy (posterior communicating artery aneurysm)

3. Hypertensive Emergency (Malignant Hypertension)

• BP: >180/120 mmHg with end-organ damage
• Headache: Severe occipital/generalized
• Blurred vision: Hypertensive retinopathy (flame haemorrhages, AV nicking, papilledema = Grade IV retinopathy)
• Other features: Encephalopathy, confusion, focal neurological signs, pulmonary edema, heart failure
• Goldman-Cecil: "obtundation, confusion, focal neurologic signs, seizures, heart failure, pulmonary edema, blurred vision, severe retinopathy confirms hypertensive emergency"

4. Acute Angle-Closure Glaucoma

• Headache: Sudden severe eye pain OR frontal/supraorbital headache
• Blurred vision: Corneal oedema causes hazy vision + coloured halos around lights
• Other features: Red eye, nausea/vomiting, fixed mid-dilated pupil, rock-hard globe
• Intraocular pressure: Can exceed 60-80 mmHg (normal 10-20 mmHg)
• Often misdiagnosed as migraine - key differentiator is the red eye and fixed mid-dilated pupil

5. Giant Cell (Temporal) Arteritis

• Age: >50 years (usually >60)
• Headache: Temporal, scalp tenderness, tender temporal artery on palpation
• Blurred vision / visual loss: Anterior ischemic optic neuropathy (AION) - can cause sudden permanent monocular visual loss (ophthalmological emergency)
• Other features: Jaw claudication, polymyalgia rheumatica, elevated ESR (>50), elevated CRP, weight loss, fever
• Risk: Permanent blindness if steroids not started immediately

6. Cerebral Venous Sinus Thrombosis (CVST)

• Headache: Progressive, can be thunderclap
• Blurred vision: Papilledema from raised ICP
• At-risk populations: Women on OCP, peripartum, hypercoagulable states
• Other features: Focal deficits, seizures, altered consciousness

7. Pituitary Apoplexy

• Headache: Sudden severe headache
• Blurred vision + visual field defects: Bitemporal hemianopia (chiasmal compression) or acute diplopia (CN III, IV, VI palsy)
• Other features: Nausea, vomiting, meningism, hypopituitarism, reduced consciousness

NEUROLOGICAL CAUSES

8. Migraine with Aura

• Headache: Unilateral, throbbing, moderate-severe, with nausea/vomiting/photophobia
• Blurred vision / Visual aura (precedes headache by 20-60 min):
  • Scintillating scotoma (zigzag lines)
  • Fortification spectra
  • Visual field defects
  • Flashing lights (photopsia)
• Subtypes with visual features:
  • Migraine with typical aura
  • Retinal migraine (monocular visual symptoms)
  • Migraine with brainstem aura (diplopia, vertigo, tinnitus)
  • Hemiplegic migraine

9. Idiopathic Intracranial Hypertension (IIH) / Pseudotumor Cerebri

• Who: Obese women of childbearing age (incidence 19-21 per 100,000 in this group)
• Headache: Dull, pressure-like, fluctuating, often occipital; worsens with Valsalva
• Blurred vision: Transient visual obscurations (seconds, coincide with peak headache), papilledema (uni or bilateral), enlarged blind spot, peripheral field loss
• Other features: Horizontal diplopia (CN VI palsy), self-audible pulsatile tinnitus, shoulder/neck pain, face numbness
• CSF pressure: 250-450 mmHg₂O (LP is both diagnostic and therapeutic)
• No mass on imaging; normal CSF composition
• Risk of permanent visual loss if untreated

10. Intracranial Tumors (Primary or Secondary)

• Headache: Dull, worse in morning or on bending/coughing; progressive
• Blurred vision: Due to papilledema from raised ICP; or direct visual pathway involvement
• Other features: Focal deficits, seizures, personality change, cognitive decline

11. Stroke / TIA (Posterior Circulation)

• Sudden headache + visual disturbance
• Types of visual disturbance:
  • Homonymous hemianopia (occipital cortex)
  • Diplopia (brainstem)
  • Transient monocular blindness = amaurosis fugax (ICA disease / retinal artery)
• Other features: Vertigo, ataxia, dysphagia, dysarthria (posterior circulation)

OPHTHALMIC CAUSES

12. Uveitis (Anterior / Posterior)

• Headache: Periorbital pain, photophobia
• Blurred vision: Cells and flare in anterior chamber
• Red eye (anterior uveitis), associated with systemic conditions (AS, sarcoidosis, IBD, reactive arthritis)

13. Optic Neuritis

• Headache/Pain: Pain on eye movement
• Blurred vision: Unilateral visual loss; RAPD (relative afferent pupillary defect)
• Associated with: Multiple sclerosis
• Central scotoma on visual field testing

14. Scleritis

• Severe boring orbital/periorbital pain (can radiate as headache)
• Blurred vision: Secondary to uveitis or scleral inflammation
• Associated with RA, vasculitis, SLE

SYSTEMIC / METABOLIC CAUSES

15. Preeclampsia / Eclampsia

• Pregnant woman (>20 weeks) or postpartum
• Headache + blurred vision are warning symptoms of severe preeclampsia (alongside epigastric pain)
• Other features: Hypertension, proteinuria, oedema, can progress to seizures (eclampsia)

16. Diabetic Maculopathy / Hypertensive Retinopathy

• Chronic blurred vision + headache from underlying HTN/DM
• Fundoscopy shows retinal changes

17. Carbon Monoxide Poisoning

• Headache (most common symptom), blurred vision, confusion, nausea
• History of exposure (indoor heating, fires)

18. Anemia (Severe)

• Throbbing headache from hyperdynamic circulation
• Visual symptoms including visual disturbance, spots

19. Hypoglycemia

• Headache, visual blurring, confusion, sweating, palpitations
• In diabetics on insulin/sulfonylureas

20. Multiple Sclerosis

• Headache uncommon, but optic neuritis (painful monocular visual loss) + other demyelinating episodes

OCULAR / REFRACTIVE CAUSES (Benign - More Common)

21. Uncorrected Refractive Errors (Myopia, Hypermetropia, Astigmatism)

• Blurred vision + eye strain headache (frontal, after prolonged reading/screen use)
• Accommodative spasm in young patients

22. Convergence Insufficiency / Accommodative Spasm

• Blurred vision on near-far shift + frontal headache; common in teenagers under stress

23. Presbyopia (Age-related)

• Near blur + headache with near work in >40 years

Quick Summary Table

• Adams & Victor's Principles of Neurology, 12e - Pseudotumor Cerebri
• Tintinalli's Emergency Medicine - Acute Angle-Closure Glaucoma
• Rosen's Emergency Medicine - Headache, IIH
• Goldman-Cecil Medicine - Hypertensive Emergency
• Bradley & Daroff's Neurology - Migraine, Headache Etiologies
• Wills Eye Manual - Ophthalmic conditions
• Creasy & Resnik's Maternal-Fetal Medicine - Preeclampsia

Headache + Blurred Vision + Loss of Consciousness - Differentials

• Diffuse cortical dysfunction (metabolic, toxic, raised ICP)
• Reticular activating system (RAS) disruption (brainstem, herniation)
• Transient cerebral hypoperfusion

PRIORITY EMERGENCIES (Act First)

1. Subarachnoid Hemorrhage (SAH)

• Thunderclap headache ("worst headache of life") → visual disturbance (subhyaloid haemorrhage, papilledema) → LOC
• LOC at onset occurs in ~50% of cases; may be brief or prolonged
• Meningism (neck stiffness, photophobia), CN III palsy (posterior communicating artery aneurysm)
• Investigations: Non-contrast CT head (first), LP if CT negative (xanthochromia)

2. Hypertensive Encephalopathy / Malignant Hypertension

• BP severely elevated (>180/120 mmHg)
• Headache → blurred vision (hypertensive retinopathy, papilledema) → confusion → LOC/coma
• PRES (Posterior Reversible Encephalopathy Syndrome): Variant - occipital headache, cortical blindness, seizures, LOC; MRI shows bilateral posterior white matter oedema
• Other features: Seizures, focal deficits, papilledema

3. Cerebral Herniation (from any raised ICP cause)

• Progressive headache → papilledema/blurred vision → deteriorating consciousness → coma
• Cushing's triad (bradycardia + hypertension + irregular breathing) = impending uncal herniation
• CN III palsy (blown pupil = fixed dilated pupil) = uncal herniation compressing CN III
• Underlying causes: Expanding haematoma (extradural, subdural, intracerebral), tumour, abscess, massive infarct

4. Eclampsia

• In pregnant or postpartum women
• Preeclampsia prodrome: headache + blurred vision + epigastric pain + hypertension + proteinuria
• → LOC with tonic-clonic seizures = eclampsia
• Rosen's Emergency Medicine: "headache, visual abnormalities and confusion, as well as focal neurologic deficits" are key warning features before seizure and loss of consciousness

5. Pituitary Apoplexy

• Sudden haemorrhage/infarction into a pituitary adenoma
• Triad: Severe sudden headache + bilateral visual changes + ophthalmoplegia
• → Cardiovascular collapse and loss of consciousness in severe cases
• Other: Meningeal irritation, CN III/IV/VI palsies, bitemporal hemianopia (chiasmal compression)
• Harrison's: "Acute symptoms may include severe headache with signs of meningeal irritation, bilateral visual changes, ophthalmoplegia, and, in severe cases, cardiovascular collapse and loss of consciousness"
• Investigations: MRI pituitary (shows haemorrhage); urgent surgical decompression if LOC or visual loss

6. Meningoencephalitis

• Headache + photophobia/visual changes + progressive LOC/coma (indicates encephalitic component)
• Fever, neck stiffness, Kernig's/Brudzinski's signs
• Herpes encephalitis specifically causes temporal lobe features + LOC
• CSF examination is diagnostic

7. Massive Ischaemic Stroke / Basilar Artery Occlusion

• Basilar artery thrombosis = classic: diplopia/blurred vision (brainstem) + severe headache + progressive LOC → "locked-in" state or coma
• Posterior circulation TIA/stroke: visual disturbances + drop attacks (transient LOC)
• Rosen's: "Because this system supplies the reticular activating system... loss of consciousness with vomiting, visual changes, and cerebral ataxia may be seen"

8. Cerebral Venous Sinus Thrombosis (CVST)

• Progressive headache → papilledema (blurred vision) → seizures → LOC
• Risk groups: OCP, postpartum, dehydration, hypercoagulable states
• Can be subacute over days to weeks
• MRI + MR venography is investigation of choice

9. Acute Subdural / Extradural Haematoma

• Extradural (EDH): Classic "lucid interval" - brief LOC, recovery, then rapid deterioration with headache + blown pupil + hemiparesis → coma (middle meningeal artery rupture)
• Subdural (SDH): Headache + blurred vision from raised ICP + gradual LOC; may occur with trivial trauma in elderly/anticoagulated patients

10. High-Altitude Cerebral Oedema (HACE)

• Headache + visual changes → ataxia + altered consciousness (hallmarks)
• Harrison's: "hallmarks are ataxia and altered consciousness with diffuse cerebral involvement... Papilledema and, more commonly, retinal haemorrhages"
• History of recent ascent to high altitude

METABOLIC / TOXIC CAUSES (LOC + Headache + Visual Symptoms)

11. Severe Hypoglycaemia

• Headache + visual disturbances → drowsiness → LOC/coma if untreated
• Washington Manual: "fatigue, dizziness, headache, visual disturbances, drowsiness...inability to concentrate, abnormal behavior, confusion, and ultimately loss of consciousness or seizures"
• History: diabetic on insulin/sulfonylurea, missed meal

12. Carbon Monoxide Poisoning

• Headache (most common symptom) + visual blurring + confusion → LOC/coma
• Cherry-red skin (unreliable sign), COHb levels diagnostic
• History: indoor fire, faulty heating, others in same location affected

13. Hyperventilation Syndrome / Hypocapnia

• Headache + visual disturbances + perioral tingling + carpopedal spasm → LOC (syncope)
• Bradley & Daroff: "lightheadedness, perioral paresthesias, visual disturbances, headache, unsteadiness... and loss of consciousness"
• Anxiety/panic attack precipitant; CO₂ low on ABG

14. Wernicke's Encephalopathy (Thiamine deficiency)

• Triad: Ophthalmoplegia/nystagmus (blurred/double vision) + ataxia + confusion/altered consciousness
• Headache may be present
• History: alcoholism, malnutrition, prolonged vomiting (hyperemesis)
• Emergency: IV thiamine before glucose

Differentiating the LOC

Red Flag Summary - "HEADACHE + BLURRED VISION + LOC" Approach

LOC sudden at onset of headache?
    → SAH (CT head stat), cardiac arrhythmia

LOC with fever + neck stiffness?
    → Meningoencephalitis (LP after CT)

LOC with very high BP + seizures?
    → Hypertensive encephalopathy / Eclampsia (if pregnant)

LOC with blown pupil (fixed dilated) + hemiparesis?
    → Transtentorial herniation - Extradural/Subdural haematoma (CT head stat)

LOC with ophthalmoplegia + severe headache?
    → Pituitary apoplexy (MRI sella)

LOC with ataxia at high altitude?
    → HACE (descend immediately + dexamethasone)

LOC with headache + visual symptoms in diabetic?
    → Hypoglycaemia (BGL stat)

LOC with CO exposure history?
    → Carbon monoxide poisoning (COHb levels, 100% O₂)